Rotating shuttle of sewing machine

Abstract

The utility model relates to a sewing machine rotating shuttle and belongs to the technical field of rotating shuttles. The rotating shuttle of the sewing machine comprises a shuttle race, a shuttle frame rotationally installed on the shuttle race and an inner shuttle pressing plate fixedly arranged on the shuttle race, the inner shuttle pressing plate is provided with an abutting portion abutting against the end face of the shuttle race and used for limiting the shuttle frame, and the side, facing the shuttle race, of the abutting portion is provided with an abutting face. The abutting portion is provided with a guiding arc groove used for guiding a wire on the outer side of the abutting face, and the inner shuttle pressing plate is provided with extending step faces at the two ends of the guiding arc groove. According to the thread guiding device, the probability that the thread is cut off and napped when passing through the end of the guiding arc groove is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of rotary hooks, and in particular to a rotary hook for a sewing machine. Background Art

[0002] The rotary hook is a key component in a sewing machine, used to guide the stitches. It rotates in conjunction with the up and down movement of the needle bar to pull the thread through the fabric, creating a continuous stitch.

[0003] Existing rotary hooks typically consist of a shuttle bed, a shuttle frame, an inner shuttle pressure plate, and a shuttle case. The shuttle frame is rotatably mounted on the shuttle bed. The inner shuttle pressure plate is fixed to the outer wall of the shuttle bed and has an abutment portion that contacts one end of the shuttle bed. The abutment portion has a guide groove for thread passing. The guide groove is curved, but in actual use, the ends of the guide groove are sharp, making it easy to cut the thread when passing. Utility Model Content

[0004] In order to reduce the probability of breakage when thread passing, the present application provides a sewing machine hook.

[0005] The present application provides a sewing machine hook adopting the following technical solution:

[0006] A sewing machine hook comprises a shuttle bed, a shuttle rack rotatably mounted on the shuttle bed, and an inner shuttle pressure plate fixedly arranged on the shuttle bed, the inner shuttle pressure plate being provided with an abutting portion abutting the end face of the shuttle bed and used for limiting the position of the shuttle rack, the abutting portion having an abutting surface on the side facing the shuttle bed, the abutting portion being provided with a guide arc groove for guiding a thread on the outer side of the abutting surface, and the inner shuttle pressure plate being provided with extended step surfaces at both ends of the guide arc groove.

[0007] By adopting the above technical solution, the setting of the guiding arc groove can guide the thread passing when the sewing machine is working. The setting of the extended step surface can increase the area at both ends of the guiding arc groove, further improving the smoothness of the thread passing. Compared with not setting the extended step surface, the probability of the thread being cut or pulled at the end of the guiding arc groove is reduced.

[0008] Optionally, the shuttle bed has a clearance groove corresponding to the extended step surface.

[0009] By adopting the above technical solution, after the inner shuttle pressure plate and the shuttle bed are connected, the space corresponding to the extended step surface and the shuttle bed is increased by setting the clearance groove, which reduces the occurrence of thread jamming.

[0010] Optionally, a reinforcement groove is circumferentially provided on the inner side wall of the inner shuttle pressure plate.

[0011] By adopting the above technical solution and strengthening the arrangement of the groove, the structural strength of the inner shuttle pressure plate is increased, thereby improving the service life of the rotary shuttle.

[0012] Optionally, a positioning block for connecting to the shuttle bed is provided on the inner shuttle pressure plate, and the outer side wall of the shuttle bed has an axial slot for axial insertion of the positioning block.

[0013] By adopting the above technical solution, the arrangement of the positioning block and the axial slot can achieve an axial positioning effect on the connection between the inner shuttle pressure plate and the shuttle bed, thereby improving the assembly efficiency of the positioning block and the inner shuttle pressure plate.

[0014] Optionally, the end of the axial slot extends circumferentially to form a circumferential sliding groove for the positioning block to rotate circumferentially.

[0015] By adopting the above technical solution, when the positioning block moves to the bottom of the axial slot, the circumferential sliding of the inner shuttle pressure plate can be achieved through the setting of the circumferential sliding groove, which is convenient for fine-tuning the inner shuttle pressure plate and facilitating the fixation of the inner shuttle pressure plate and the shuttle bed.

[0016] Optionally, the positioning block is disassembled and installed on the inner shuttle pressure plate, and the inner shuttle pressure plate has an installation groove for installing the positioning block, the inner wall of the installation groove is provided with a locking hook, and the outer wall of the positioning block is provided with a locking groove that cooperates with the locking hook.

[0017] By adopting the above technical solution, when installing the positioning block, the positioning block is inserted into the installation groove, and the positioning block drives the locking hook to move toward the inner wall of the installation groove. When the locking groove and the elastic buckle correspond, the elastic buckle automatically resets to achieve locking. The positioning block is more convenient to install and the connection is stable.

[0018] Optionally, rolling balls are embedded in the positioning block.

[0019] By adopting the above technical solution and setting the rolling ball, the smoothness of the inner shuttle pressure plate when rotating along the central axis of the shuttle bed is improved.

[0020] Optionally, a connecting through hole is opened circumferentially on the inner shuttle pressure plate, the shuttle bed has connecting screw holes corresponding one to one to the connecting through holes, and the shuttle bed is provided with connecting bolts in the connecting screw holes.

[0021] By adopting the above technical solution, the inner shuttle pressure plate is positioned and installed on the shuttle bed, and then the inner shuttle pressure plate is adjusted so that the connecting through hole and the connecting screw hole correspond to each other, and finally the connecting bolt is passed through the connecting through hole and the connecting screw hole to achieve a fixed connection between the inner shuttle pressure plate and the shuttle bed.

[0022] Optionally, the circumferential groove corresponds to the central axis of the connecting screw hole in the circumferential direction.

[0023] By adopting the above technical solution, the positional relationship between the circumferential slide groove and the connecting screw hole is defined, which makes it easier for assemblers to adjust the inner shuttle pressure plate.

[0024] Optionally, a guide flare for inserting the positioning block is provided at the opening of the axial slot.

[0025] By adopting the above technical solution and setting the guide flaring, it is convenient for the positioning block to be inserted into the axial slot, thereby improving the positioning and installation efficiency of the inner shuttle pressure plate.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By extending the step surface, the present invention increases the area at both ends of the guide arc groove, further improving the smoothness of the wire passing and reducing the probability of breakage during wire passing;

[0028] 2. The present application can achieve axial positioning of the connection between the inner shuttle pressure plate and the shuttle bed through the cooperation of the positioning block and the axial slot, thereby improving the assembly efficiency of the positioning block and the inner shuttle pressure plate;

[0029] 3. The present application can realize the circumferential sliding of the inner shuttle pressure plate by setting the circumferential groove, which is convenient for fine-tuning the inner shuttle pressure plate so that the connecting through hole and the connecting thread correspond. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0031] Figure 2 It is a structural schematic diagram of the inner shuttle pressure plate of an embodiment of the present application.

[0032] Figure 3 It is a structural schematic diagram of the give way slot in an embodiment of the present application.

[0033] Figure 4 It is an exploded schematic diagram of the inner shuttle pressure plate and the shuttle bed in the embodiment of the present application.

[0034] Figure 5 It is a cross-sectional schematic diagram of the positioning block after installation in the embodiment of the present application.

[0035] Explanation of the reference numerals: 1. shuttle bed; 11. give way groove; 12. connecting screw hole; 13. connecting bolt; 14. axial slot; 141. guide flare; 15. circumferential slot; 2. shuttle rack; 3. inner shuttle pressure plate; 31. abutment portion; 311. abutment surface; 312. guide arc groove; 313. extended step surface; 314. inclined transition surface; 32. fitting portion; 33. connecting through hole; 34. reinforcement groove; 341. mounting groove; 342. locking hook; 35. positioning block; 351. locking groove; 352. rolling ball. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-5 This application is described in further detail.

[0037] The embodiment of the present application is a rotary hook of a sewing machine.

[0038] Reference Figure 1 A sewing machine hook comprises a shuttle bed 1, a shuttle rack 2 rotatably mounted on the shuttle bed 1, and an inner shuttle pressure plate 3 fixedly mounted on the top of the shuttle bed 1 and used for pressing the shuttle rack 2.

[0039] Reference Figure 1 and Figure 2 The inner shuttle pressing plate 3 is semicircular in shape and includes an abutting portion 31 for abutting against one end face of the shuttle bed 1 and an abutting portion 32 for abutting against the outer wall of the shuttle bed 1. The abutting portion 31 and the abutting portion 32 are integrally formed. The abutting portion 31 has an abutting surface 311 on the side facing the shuttle bed 1 for abutting against the end face of the shuttle bed 1.

[0040] The abutting surface 311 is an arcuate surface, and its inner diameter is smaller than the inner diameter of the end surface of the shuttle bed 1 , that is, the projection of the abutting surface 311 on the axis can cover the corresponding areas of the shuttle bed 1 and the abutting surface 311 .

[0041] The abutment portion 31 is provided with a guide arc groove 312 on the inner side of the abutment surface 311, near the central axis. Both ends of the guide arc groove 312 extend through the ends of the abutment surface 311. The inner shuttle pressure plate 3 also has an extended stepped surface 313 at the end of the guide arc groove 312. The extended stepped surface 313 is flush with the bottom wall of the guide arc groove 312, increasing the area of the ends of the guide arc groove 312 and reducing the probability of breakage during thread passing. The connection between the extended stepped surface 313 and the abutment surface 311 is an inclined transition surface 314. The end surface of the shuttle bed 1 also has a clearance groove 11 corresponding to one of the extended stepped surfaces 313 to further increase thread passing space.

[0042] The fitting portion 32 defines a plurality of connecting through-holes 33 along the central axis of the inner shuttle pressure plate 3. The shuttle bed 1 has connecting screw holes 12 corresponding one-to-one with the connecting through-holes 33. The shuttle bed 1 also has a plurality of connecting bolts 13 positioned adjacent to the connecting screw holes 12. The bolts 13 and the connecting screw holes 12 cooperate to securely connect the inner shuttle pressure plate 3 to the shuttle bed 1. The inner sidewall of the fitting portion 32 is circumferentially spaced with reinforcement grooves 34, which are arranged alternately with the connecting through-holes 33. The inner diameter of the reinforcement grooves 34 is larger than the inner diameter of the connecting through-holes 33.

[0043] In order to improve the assembly efficiency of the inner shuttle pressure plate 3 and the shuttle bed 1, a positioning block 35 is provided on the inner shuttle pressure plate 3, and the positioning block 35 cooperates with the shuttle bed 1 to achieve pre-positioning of the inner shuttle pressure plate 3 and the shuttle bed 1, thereby facilitating the assembly equipment or assembly personnel to pass the connecting bolts 13 through the inner shuttle pressure plate 3 and the shuttle bed 1 in sequence.

[0044] In this embodiment, two positioning blocks 35 are provided on the inner shuttle pressure plate 3 . Both positioning blocks 35 are located on the inner wall of the reinforcement groove 34 , and the positioning blocks 35 correspond to the central axis of the connecting through hole 33 in the circumferential direction.

[0045] The outer wall of the shuttle bed 1 has an axial slot 14 for axially inserting the positioning block 35. The axial slot 14 is also provided with a guide flare 141 near the opening of the inner shuttle pressure plate 3 to facilitate the insertion of the positioning block 35 into the axial slot 14 and improve the insertion efficiency of the positioning block 35.

[0046] The ends of the axial slots 14 extend circumferentially to both sides, forming circumferential grooves for the positioning blocks 35 to slide in. These grooves correspond to the connecting screw holes 12, so that after the positioning blocks 35 are inserted, the assembler can slide the inner shuttle pressure plate 3 circumferentially to align the connecting through holes 33 with the connecting screw holes 12, facilitating the insertion of the connecting bolts 13.

[0047] The positioning block 35 is detachably connected to the inner shuttle pressure plate 3. The inner shuttle pressure plate 3 has a mounting slot 341 formed in the reinforcement slot 34 for the positioning block 35. The dimensions of the mounting slot 341 are compatible with those of the positioning block 35. The shuttle bed 1 has locking hooks 342 pivotally mounted on the inner sidewalls of the mounting slot 341, with the center of rotation located at the bottom of the slot 341. The locking hooks 342 are tilted and secured to opposing sides of the slot 341 by springs. Before the positioning block 35 is installed, the two locking hooks 342 tend to move toward each other. The opposing sides of the positioning block 35 have locking slots 351 that engage with the locking hooks 342.

[0048] The locking hook 342 also has a guide slope on the side of the opening facing the mounting groove 341, which is inclined downward toward the bottom of the mounting groove 341, so that when the positioning block 35 is inserted, the positioning block 35 drives the two locking hooks 342 to move away from each other. When the locking hook 342 and the locking groove 351 correspond, the locking hook 342 automatically resets and snaps into the locking groove 351.

[0049] To enhance the smooth circumferential sliding of the inner shuttle pressure plate 3, a ball bearing 352 is embedded in the end of the positioning block 35. The ball bearing 352 rotates in engagement with the positioning block 35. The radial width of the positioning block 35 matches the radial width of the axial slot 14, enabling the contact portion 32 to contact the outer wall of the shuttle bed 1.

[0050] The implementation principle of the rotary hook of a sewing machine in an embodiment of the present application is as follows: first, align the positioning block 35 of the inner shuttle pressure plate 3 with the axial slot 14, then insert the inner shuttle pressure plate 3 axially, and the positioning block 35 moves axially in the axial slot 14. After the positioning block 35 moves to the end of the axial slot 14, the inner shuttle pressure plate 3 is rotated circumferentially according to the correspondence between the connecting through hole 33 and the connecting screw hole 12, so that the connecting through hole 33 and the connecting screw hole 12 correspond coaxially. Finally, the connecting bolt 13 is passed through the connecting through hole 33 and threadedly engaged with the connecting screw hole 12 to achieve a fixed connection between the inner shuttle pressure plate 3 and the shuttle bed 1.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sewing machine rotary hook, comprising a shuttle bed (1), a shuttle frame (2) rotatably mounted on the shuttle bed (1), and an inner shuttle pressure plate (3) fixedly arranged on the shuttle bed (1), wherein the inner shuttle pressure plate (3) is provided with an abutting portion (31) abutting against an end surface of the shuttle bed (1) and used for limiting the position of the shuttle frame (2), and is characterized in that: The abutment portion (31) has an abutment surface (311) on a side facing the shuttle bed (1), the abutment portion (31) is provided with a guide arc groove (312) for guiding the wire on the inner side of the abutment surface (311), and the inner shuttle pressure plate (3) is provided with extended step surfaces (313) at both ends of the guide arc groove (312).

2. A sewing machine hook according to claim 1, characterized in that: The shuttle bed (1) has a clearance groove (11) corresponding to the extended step surface (313).

3. The sewing machine hook according to claim 1, characterized in that: A reinforcement groove (34) is circumferentially provided on the inner side wall of the inner shuttle pressure plate (3).

4. The sewing machine hook according to claim 1, characterized in that: A positioning block (35) for connecting to the shuttle bed (1) is provided on the inner shuttle pressure plate (3), and an outer side wall of the shuttle bed (1) has an axial slot (14) for axial insertion of the positioning block (35).

5. The sewing machine hook according to claim 4, characterized in that: The opening of the axial slot (14) is provided with a guide flare (141) for inserting the positioning block (35).

6. The sewing machine hook according to claim 4, characterized in that: The end of the axial slot (14) extends circumferentially to form a circumferential sliding groove.

7. The sewing machine hook according to claim 4, characterized in that: The positioning block (35) is detachably mounted on the inner shuttle pressure plate (3); the inner shuttle pressure plate (3) has a mounting groove (341) for mounting the positioning block (35); an inner wall of the mounting groove (341) is provided with a locking hook (342); and an outer wall of the positioning block (35) is provided with a locking groove (351) that cooperates with the locking hook (342).

8. The sewing machine hook according to claim 6, characterized in that: A connecting through hole (33) is provided on the circumferential direction of the inner shuttle pressure plate (3), and the shuttle bed (1) has connecting screw holes (12) corresponding one-to-one to the connecting through holes (33).

9. The sewing machine hook according to claim 8, characterized in that: The circumferential sliding groove corresponds to the central axis of the connecting screw hole (12) in the circumferential direction.

10. The rotary hook of a sewing machine according to claim 4, characterized in that: A rolling ball (352) is embedded and installed on the positioning block (35).

Images